S
M
T
W
T
F
S
30
74°
58°
31
75°
57°
1
71°
52°
2
76°
59°
3
81°
56°
4
81°
53°
5
76°
48°
6
74°
49°
7
75°
56°
8
78°
51°
9
78°
46°
10
69°
45°
11
67°
45°
12
67°
46°
13
69°
49°
14
68°
43°
15
66°
42°
16
64°
42°
17
65°
43°
18
65°
42°
19
66°
43°
20
65°
43°
21
66°
48°
22
70°
52°
23
70°
42°
24
73°
52°
25
70°
49°
26
72°
40°
27
62°
49°
28
63°
49°
29
64°
47°
30
64°
46°
1
63°
43°
2
59°
42°
3
60°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in South Haven
South Haven's September 2026 forecast shows daily high temperatures ranging from 59° to 81°, with overnight lows between 40° and 59°. The average high for September is 69° with an average low of 48°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in South Haven. See also: October | November | December.
